.nav {
    display: flex;
    width: 50vw;
    height: 50px;
    line-height: 50px;
    background-color: #1e1f1c;
    .navItem {
        flex: 1;
        color: white;
        text-align: center;
    }
}

.demo {
    color: red;
    font-size: 60px;
}